Hydrangea Derby volunteers maintain the hydrangea garden in Darley Park where we grow more hydrangeas than anywhere else in the UK. Volunteers work in the garden every week from March to November. Guided by Plant Heritage, we also identify, document and preserve the national collection of Hydrangea paniculata within the garden. Hydrangea Derby is completely self-funded and relies on the kind donations of visitors to continue to keep the garden looking beautiful for everyone.